He was sentenced to two years jail in April for his part in security van robberies.

The judge reduced the sentence after hearing he blames himself for Michael's death.

The court was told that he "carries around with him the thought that it should have been him".

Sannoh, 19, of Peckham, and Noor, 22, of Camberwell, were found guilty of murder at the Old Bailey after the jury spent nine days deliberating.

Jonathan Laidlaw, QC, prosecuting, said: "The intruders turned the light on and opened fire with a Mach-10 at a figure lying wrapped in a duvet."

"That person had no chance of surviving. He had done nothing wrong.

"It was a well-planned and well-executed execution. Over and above the shocking nature of this shooting, the tragedy is that these two defendants killed the wrong person."

The gunmen were taking part in a revenge attack following the murder of another man.

Following the final robbery, three days before the killing, Sannoh's friend Javarie Crighton, one of the robbers, had been stabbed to death after confronting organiser Orando Madden about money.

Madden had surrendered to police after the incident and that left only Hakeem as the target for revenge for Sannoh, said Mr Laidlaw.

There were rumours that Madden had cheated the younger robbers and that Hakeem had the money, he added.

Michael's father Rasak Dosunmu punched the air with his fist as each man was convicted of his son's murder.

He said outside court: "It has been emotionally draining coming here every day to wait for the verdict.

"We have to thank God that it is over. This case was so complicated. I thank the police and counsel."

His wife, Shakira, wept as she left court.